JetBlue has a one-day deal, good through 11:59pm ET tonight. Book any flight starting in the US and save up to 20%. For trips running 5/1-5/23 coupon code SPRING20 saves you 20%, and for trips running 5/28-6/19 coupon code SPRING15 saves you 15%. Start with their Save Now, Spring Later page and then visit jetblue.com/promo to book with your coupon code.